Ok, this is sure to be a hot topic but I figured it was time to open a can of worms ....

For those of you with 2012 or newer F350 Dually's , I'd be curious to know what speeds and mpg you get. I've now towed my 36RL about 15,000 miles total. Have been in all kinds of terrain other than the western mountains (hopefully this summer for that ).

In my truck with the 3.73 gears and in regular conditions, ie rolling hills , mostly semi flat, no mountains, I get a consistent 10.3 -10.5 mpg when running 68 mph. I find in mine, if I run slower, say 62-63, I actually lose about .4 mpg. If I run 70, doesn't seem to change any.

I haven't tried going considerably slower as here in the North East you would get run over and off the road by Semis. If you don't run with the traffic you literally take your life in your hands.....

As the saying goes, your mileage may vary, but I'm curious what the others are seeing.

This year we've logged about 8,000 miles towing, I typically drive at about ~65mph, really focus more on the tack and keep it at ~1,700rpm and we're averaging 10.2 mpg. I'll experiment at a little faster speed to see what happens over the next couple of months.

I don't fall into your 2012 or above classification but with my 2011 6.7 engine I have averaged right at 11.2 over about 30k miles. Depending on wind, hills, and traffic as low as 8.5 and as high as 13. Also a 3.73 rear end.